Add SSL certificate to homepage

and rewrite some tasks

ansible/roles/symfony-app/templates/app.conf.j2

@@ -2,7 +2,7 @@ server {
     server_name {{ app_domains | join(" ") }};
 
     {% if app_cert %}
-        listen 443 ssl http2 deferred;
+        listen 443 ssl http2;
     {% else %}
         listen 80;
     {% endif %}